<div class="dropdown open">
<button class="btn btn-secondary dropdown-toggle"
type="button" id="dropdownMenu5" data-toggle="dropdown"
aria-haspopup="true" aria-expanded="false">
Dropdown
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item disabled" href="#">Disabled action</a>
</div>
</div>